Somewhat unrelated - I tried both adderall and ritalin. While these certainly help with my attention/focus issues, I often get a weird side-effect - it makes me

Somewhat unrelated - I tried both adderall and ritalin. While these certainly help with my attention/focus issues, I often get a weird side-effect - it makes me sleepy. My doc is completely puzzled by it. Nor I see much of such mentions in internet. I wonder if any1 else here had such effect from stimulants? (it is not lack of sleep - I get 7+ hours at night and occasional hour during the day).